Orientation Orientation describes the direction that air will flow through a piece of equipment. (e.g. air will flow horizontally through a "Horizontal" unit heater.) Most equipment will only function properly if installed in the proper orientation.

A vertical model of Belt-Driven Air Handlers for both hydronic and DX applications, these rugged units are dependable air handlers. Also in a heavy-gauge, galvanized steel cabinet, the Vertical Basic Belt Drive air handler (AV-B) includes all the same components as the Williams Horizontal Basic model, only available as a vertical configuration. Access doors are provided on both sides of the unit for easy maintenance.